Backed roll mill



Nov. 28, 1939. 5, c u I 2,181,173

BACKED ROLL MILL Filed Sept. 11, 1936 2 Sheets-Sheet l INVENTOR (PM WWmum Nov. 28, 1939. CATULVLE- BACKED ROLL MILL 2 Sheets-Sheet 2' FiledSept. 11, 1936 lNVENTOR Patented Nov. 28, 1939 UNITED STATES PATENT.OFFICE sacrum non. mm. Gene Catulle, Brackcnridge, Pa. ApplicationSeptember 11, 1936, Serial No. 100,302

1 Claim.

This invention relates to backed roll mills and is of particular valuein connection with mills for use in the rolling of flat material such asstrips, sheets and plates.

6. An object of this invention is to produce an improved backed rollmill in which the deflections occasioned during rolling can bepredetermined and reduced to a minimum.

, Another object is to produce a hacked roll mill which for a given size(maximum width of material capable of being rolled) is materiallycheaper to construct than backed roll mills of the present designswhether of the four-high type oi the cluster type.

" A further object is to produce a backedroll mill housing in whichthere are no reentrant angles in those portions thereof which aresubjected to the stresses occasioned during rolling.

A still further object is to produce a backed roll mill in which thestress to which the housing posts is subjected during rolling can bepredetermined. f

A further object is to produce a mill in which during rolling thehousing posts are directly loaded and not eccentrically loaded as arethe housing posts of allpresent types of backed roll mills.

A still further object is to produce a mill in which it is possible topredetermine the stretch 30 of the housing as well as the totaldeflection under different roll reductions.

These, as well as other objects, I attain by means of the mill describedin the specification and more or less diagrammatically illustrated inthe drawings accompanying and forming part of this application.

In the drawings:

Figure l is a sectional elevation of a mill embodying this invention andFig 2 is a view in side elevation of said mill.

In a mill of this invention, the reducing or working rolls arepreferably of relatively small diameter as is the practice in thepresent types of backed roll mills. Each of these reducing rolls isbacked by a pair of axially aligned backing rolls of moderate diameterinstead of being ill backed by a single roll of relatively largediameter as in the present types of four-high mills.

' The bearings for the necks of each pair of ax-' Each housing of mymill is a unitary casting comprising front and rear corner posts oruprights and top and bottom connecting members. These housingsa'recross-connected by means of extremely rigid top and bottom bridgingmembers. These bridging membe s form the top 6 and bottom'members of themill stand and each such member is provided with spaced end tenons orprojections which extend into recesses, openings or mortises formed fortheir reception in the housing corner posts adjacent their upper and 10lower ends.

The top bridging member carries the two screwdowns or adjusting screwsand these bear against breaker blocks carried by the upper backing rollsupport in line with the backing roll 16 bodies or between the inner andouter neck bearings fonthe backing 'rolls.

The bottom bridging member is provided with two upstanding pads whichcontact with the bottom of the lower backing roll support and 20 are inline with the breaker blocks and have substantially the same contactarea.

' Each of the housings of the mill diagrammatically illustrated in thedrawings is made up of .front and rear corner posts 5, a top member 6,and a bottom member 1. These parts are preferably formed as an integralunitary casting. A top bridging member 8 which spans the space betweenthe housings and which forms a top member for the mill stand is providedat each end with two spaced apart tenons or projections 9 which fitwithin Openingarecesses or mortises l0 provided for their reception atthe centers of the housing corner posts or uprights 5 and adjacent thetops of the same.

A bottom bridging member I I which spans the space between the housingsadjacent their lower ends is also provided with spaced apart endprojections or tenons in this case numbered I 2 which fit withincentrally located openings, recesses or 40 mortises l3 vformed for theirreception at the center or the housing corner posts and adjacent thelower ends thereof. The top and bottom bridging members are secured inaligned position by means of suitable wedges (not shown), which; aredriven into position between projections 9, l2 and the walls of theopenings or mortises I0. l3 into which they extend.

The housings are-securely-held in proper relative position and in rigidcontact with'the ends 5 of the bodies of the bridging members 6 and I bymeans of suitable tie rods l4.

The reducing rolls 15,16 are preferably of relatively small diameter asis now customary and the necks of these rolls arejournaled withinbearings II of any desired or preferred type. These hearings or rathertheir housingsor support members II, I! lit within the housing windows24. One end 01 each reducing roll is machined as shown at 2| toaccommodate a cou-' pling member (not shown) by which the rolls areadapted to be connected to suitable driving mechanism such as a motor orpinion stand.

Each reducing roll is backed by a pair of axially aligned backing rolls.In thecase of lower reducing roll I, the backing rolls are numbered 22and 22 and in the case of upper reducing roll II, .the backing rolls arenumbered 24 and 25. The bearing assemblies for theouter necks of thelower pair of backing rolls 22-23 are numbered 26 and those for theinner necks 21. These assemblies are carried by a support member 28which spans the space between the housings and at its ends is designedto fltwithin the housing windows.- This member '1 term the lowerbacking' roll support member.

A similar support 29 spans the space between the housings above theupper backing rolls 24-25 and-its ends are also designed to fit withinhousing windows 20. This support member, which I term the upper backingroll support member, carries the bearing assemblies for the necks ofupper backing rolls 24-25.

member 8 is drilled for the receptionapart one from the other and fromthe housings and the pressure of each is exerted on backing roll support29 in line with the backing bodies or between the inner and outer necksoi one oi the upper backing rolls 24-25.

Lower bridging member II, in line with each breaker. block 23 isprovided with an upstanding pad -34 of substantially the same contactarea as the breaker blocks.

. Compression springs 35 which are positioned between bearing housingsof blocks 14 and I! for the reducing roll necks at each side of the millyieldingly hold upper reducing roll I! in contact with its rolls 24-2l.

.The housingaasis'usuahareprovidedwlth ,shoes 34 which cooperate withsuitable rails 21. "Ihebackingrolisupportmembersfltting into the housingwindows "as they do and being of exertmely rigid construction, keep thebacking rolls in proper alignment. By positioning adjusting screws I2and contact pads 31 in the manner disclosed, I form supports for backingroll support members 22 and" such that the deilections under load arenot only equal but are determinable. These backing roll support membersmay be treated as simple beams each with a load at its center and withloads at its overhanging ends.

It will be seen that in the mill herein disclosed, there are noreentrant' angles in those portions of the housings which are subjectedto stresses occasioned during rolling and since the housing posts aredirectly loaded, the stress to which they are subjected duringrolling'and therefore their stretch can be predetermined.

While I have merely shownplain bearings for both the reducing andbacking rolls, I contemplate using anti-friction bearings of anywellknown type for the necks of the reducing rolls as well as for thenecks of the backing rolls.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is:

The combination in a backed roll mill, 01' separately formed millhousings each having front 1 and rear posts and connecting portionsbetween their upper and lower ends and with said posts defining thehousing windows, top and bottom bridging members extending between thetops,

and bottoms of said housings and having tenons fitting into centrallylocated openings within and adjacent the tops and bottoms of said posts,a

pair of reducing rolls, a pair oi. axially aligned- Gm cam.

